To the right of the famous 'Water Theatre', we find the Apollo Room, whose vault was decorated by Domenico Passignano; a reproduction of Parnassus was placed here with wooden figurines, stucco and wrought-iron flowers, the work of Giovanni Anguilla and Jacques Sarrazin. Giovanni Guglielmi had made the hydraulic devices that allow all the Parnassus figurines to play their instruments. The walls of the room are frescoed with the 'Ten Stories of Apollo' by Domenichino.